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Jul 20, 2013
07/13

by
Wolgang Eholzer; Nils-Peter Skoruppa

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We describe the construction of vector valued modular forms transforming under a given congruence representation of the modular group SL$(\bold Z)$ in terms of theta series. We apply this general setup to obtain closed and easily computable formulas for conformal characters of rational models of $W$-algebras.

Source: http://arxiv.org/abs/math/9411214v1

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Jul 20, 2013
07/13

by
Benjamin Grinstein

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Introductory lectures (delivered at TASI, June 1994) on heavy quarks and heavy quark effective field theory. Applications to inclusive semileptonic decays and to interactions with light mesons are covered in detail.

Source: http://arxiv.org/abs/hep-ph/9411275v1

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Jul 20, 2013
07/13

by
S. Dimopoulos; L. J. Hall

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In a class of supersymmetric grand unified theories, including those based on the gauge group $SO(10)$, there are new contributions to the electric dipole moments of the neutron and electron, which arise as a heavy top quark effect. These contributions arise from CKM-like phases, not from phases of the supersymmetry breaking operators, and can be reliably computed in terms of the parameters of the weak scale supersymmetric theory. For the expected ranges of these parameters, the electric dipole...

Source: http://arxiv.org/abs/hep-ph/9411273v1

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20

Sep 22, 2013
09/13

by
J. Klenner; A. Schäfer; W. Greiner

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Diffractive meson production at HERA offers interesting possibilities to investigate diffractive processes and thus to learn something about the properties of the pomeron. The most succesful phenomenological description of the pomeron so far assumes it to couple like a $C = +1$ isoscalar photon to single quarks. This coupling leads, however, to problems for exclusive diffractive reactions. We propose a new phenomenological pomeron vertex, which leads to very good fits to the known data, but...

Source: http://arxiv.org/abs/hep-ph/9409451v2

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Jul 20, 2013
07/13

by
C. Ciofi degli Atti; E. Pace; G. Salmè

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The theory of quasi-elastic inclusive scattering of polarized leptons off polarized $^3$He is critically reviewed and the origin of different expressions for the polarized nuclear response function appearing in the literature is explained. The sensitivity of the longitudinal asymmetry upon the neutron form factors is thoroughly investigated and the role played by the polarization angle for minimizing the proton contribution is illustrated.

Source: http://arxiv.org/abs/nucl-th/9411006v1

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Jul 20, 2013
07/13

by
Y. P. Jing; H. J. Mo; G. Boerner; L. Z. Fang

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We investigate, using high resolution N-body simulations, the density profiles and the morphologies of galaxy clusters in three models of structure formation. We show that these properties are closely related to the occurrence of a significant merging event to a cluster in the recent past. The three models are: (1) the standard CDM model (SCDM) with $\Omega_0 = 1$, $\Lambda_0=0$ and $h=0.5$; (2) a low-density flat model (LCDM) with $\Omega_0=0.3$, $\Lambda_0=0.7$ and $h=0.75$; (3) a CDM...

Source: http://arxiv.org/abs/astro-ph/9411045v1

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9.0

Sep 22, 2013
09/13

by
Thomas M. Gould; Stephen D. H. Hsu

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We extend our previous results on the evolution of quantum fermi fields in Minkowski gauge field backgrounds to the case of spontaneously broken gauge theories. We obtain a selection rule which relates the amount of fermion number violation to the change in Higgs winding number of the configuration. This selection rule is applicable to any classical solution which dissipates at both early and late times.

Source: http://arxiv.org/abs/hep-ph/9410408v2

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Jul 20, 2013
07/13

by
F. Ravanini; M. Stanishkov; R. Tateo

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We give evidence, by use of the Thermodynamic Bethe Ansatz approach, of the existence of both massive and massless behaviours for the $\phi_{2,1}$ perturbation of the $M_{3,5}$ non-unitary minimal model, thus resolving apparent contradictions in the previous literature. The two behaviours correspond to changing the perturbing bare coupling constant from real values to imaginary ones. Generalizations of this picture to the whole class of non-unitary minimal models $M_{p,2p\pm 1}$, perturbed by...

Source: http://arxiv.org/abs/hep-th/9411085v1

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70

Jul 20, 2013
07/13

by
F. ~Karsch; E. Laermann; M. Lütgemeier

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We establish a close relation between the spatial string tension of the (3+1)-dimensional $SU(3)$ gauge theory at finite temperature ($\sigma_s$) and the string tension of the 3-dimensional $SU(3)$ gauge theory ($\sigma_3$) which is similar to what has been found previously for $SU(2)$. We obtain $\sqrt{\sigma_3} = (0.554 \pm 0.004) g_3^2$ and $\sqrt{\sigma_s} = (0.586 \pm 0.045)g^2(T) T$, respectively. For temperatures larger than twice the critical temperature results are consistent with a...

Source: http://arxiv.org/abs/hep-lat/9411020v1

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Jul 20, 2013
07/13

by
R. N. Mohapatra; S. Nussinov

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If the upper limit on the effective (Majorana) neutrino mass from neutrinoless double beta decay experiments is confirmed to be much less than an electron-volt, then one way to reconcile it with the degenerate neutrino mass pattern suggested recently to explain the observed deficit of solar and atmospheric neutrinos as well as neutrinos as HDM is to postulate that there be maximal mixing among the three light (or two) neutrinos. This suggestion is advanced in this paper and is analysed.

Source: http://arxiv.org/abs/hep-ph/9411274v1

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Jul 20, 2013
07/13

by
Atle Ro

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A theory of interlanguage (IL) lexicons is outlined, with emphasis on IL lexical entries, based on the HPSG notion of lexical sign. This theory accounts for idiosyncratic or lexical transfer of syntactic subcategorisation and idioms from the first language to the IL. It also accounts for developmental stages in IL lexical grammar, and grammatical variation in the use of the same lexical item. The theory offers a tool for robust parsing of lexical transfer errors and diagnosis of such errors.

Source: http://arxiv.org/abs/cmp-lg/9411018v1

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Jul 20, 2013
07/13

by
Xing Zhuge; Joan M. Centrella; Stephen L. W. McMillan

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We calculate the gravitational radiation produced by the merger and coalescence of inspiraling binary neutron stars using 3-dimensional numerical simulations. The stars are modeled as polytropes and start out in the point-mass limit at wide separation. The hydrodynamic integration is performed using smooth particle hydrodynamics (SPH) with Newtonian gravity, and the gravitational radiation is calculated using the quadrupole approximation. We have run several simulations, varying both the...

Source: http://arxiv.org/abs/gr-qc/9411029v1

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Jul 20, 2013
07/13

by
H. -C. Cheng; L. J. Hall

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In the minimal supersymmetric standard model, assuming universal scalar masses at large energies, there are four intragenerational relations between the masses of the squarks and sleptons for each light generation. In this paper we study the scalar mass relations which follow only from the assumption that at large energies there is a grand unified theory which leads to a significant prediction of the weak mixing angle. Two new intragenerational mass relations for each of the light generations...

Source: http://arxiv.org/abs/hep-ph/9411276v1

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Jul 20, 2013
07/13

by
J. D. Bryngelson; J. N. Onuchic; N. D. Socci; P. G. Wolynes

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The understanding, and even the description of protein folding is impeded by the complexity of the process. Much of this complexity can be described and understood by taking a statistical approach to the energetics of protein conformation, that is, to the energy landscape. The statistical energy landscape approach explains when and why unique behaviors, such as specific folding pathways, occur in some proteins and more generally explains the distinction between folding processes common to all...

Source: http://arxiv.org/abs/chem-ph/9411008v1

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89

Jul 20, 2013
07/13

by
Dimitra Karabali

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We discuss how a large class of incompressible quantum Hall states can be characterized as highest weight states of different representations of the \Winf algebra. Second quantized expressions of the \Winf generators are explicitly derived in the cases of multilayer Hall states, the states proposed by Jain to explain the hierarchical filling fractions and the ones related by particle-hole conjugation.

Source: http://arxiv.org/abs/hep-th/9411082v1

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Jul 20, 2013
07/13

by
P. W. Stephenson

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We investigate point-to-point correlation functions for various mesonic and baryonic channels using the ${\cal O}(a)$-improved Wilson action due to Sheikholeslami and Wohlert. We consider propagators to both time slices 0 and 1. We find that discretisation effects are more pronounced than those reported with unimproved Wilson fermions, but that the same procedure for removing finite size effects is successful. Extrapolating to the chiral limit, we see the notable features predicted...

Source: http://arxiv.org/abs/hep-lat/9411022v1

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Jul 20, 2013
07/13

by
E. Garrido; J. A. Caballero; E. Moya de Guerra; P. Sarriguren; J. M. Udias

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We present results for response functions and asymmetries in the nuclear reactions 37\vec{Ar}(\vec{e},e'n)36Ar and 37\vec{K}(\vec{e},e' p)36Ar at quasifree kinematics. We compare PWIA results obtained using deformed HF wave functions with PWIA and DWIA results obtained assuming a spherical mean field. We show that the complex structure of the deformed orbitals can be probed by coincidence measurements with polarized beam and targets.

Source: http://arxiv.org/abs/nucl-th/9411007v1

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69

Jul 20, 2013
07/13

by
Gang Su; Bao-Heng Zhao

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We show that in the translation invariant case and in the antiferromagnetic phase, the reduced density matrix $\rho _2$ has no off-diagonal long-range order of on-site electron pairs for the single-band Hubbard model on a cubic lattice away from half filling at finite temperatures both for the positive coupling and for the negative coupling. In these cases the model can not give a mechanism for the superconductivity caused by the condensation of on-site electron pairs and the nearest-neighbor...

Source: http://arxiv.org/abs/cond-mat/9411044v1

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31

Jul 20, 2013
07/13

by
James T. Wheeler

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The gauge bundle of the 4-dim conformal group over an 8-dim base space, called biconformal space, is shown have a consistent interpretation as a scale-invariant phase space. Specifically, we show that a classical Hamiltonian system generates a differential geometry which is necessarily biconformal, and that the classical Hamiltonian dynamics of a point particle is equivalent to the specification of a 7-dim hypersurface in flat biconformal space together with the consequent necessary existence...

Source: http://arxiv.org/abs/gr-qc/9411030v1

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Jul 20, 2013
07/13

by
A. Bramon; A. Grau; G. Pancheri

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The accuracy of effective chiral lagrangians including vector-mesons as (hidden symmetry) gauge fields is shown to be improved by taking into account SU(3)-breaking in the vector-meson sector. The masses, $M_V$, and couplings to the photon field and pseudoscalar pairs, $f_{V\gamma}$ and $g_{VPP}$, are all consistently described in terms of two parameters, which also fit the values for the pseudoscalar decay-constants, $f_P$, and charge radii, $$. The description of the latter is further...

Source: http://arxiv.org/abs/hep-ph/9411269v1

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115

Jul 20, 2013
07/13

by
Robert H. Brandenberger

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An introduction to modern cosmology is given, focusing on theories for the origin of structure in the Universe. After a brief review of the theory of growth of cosmological perturbations and a summary of some important observational results, most of the article is devoted to discussions of the inflationary Universe scenario and of topological defect models of structure formation. The final chapter is a summary of the theory of cosmic microwave background temperature fluctuations and of the...

Source: http://arxiv.org/abs/astro-ph/9411049v1

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34

Jul 20, 2013
07/13

by
Hendrik Grundling

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For a manifold M we define a structure on the group action of Diff(M) on the smooth functions on M which reduces to the usual differential geometry upon differentiation at zero along the one-parameter groups of Diff(M). This ``integrated differential geometry'' generalises to all group actions on associative algebras, including noncommutative ones, and defines an ``integrated de Rham cohomology,'' which provides a new set of invariants for group actions. We calculate the first few integrated de...

Source: http://arxiv.org/abs/hep-th/9411079v1

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54

Jul 20, 2013
07/13

by
A. Bramon; E. Shabalin

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The branching ratios of weak decays of $\eta$ mesons are estimated in the framework of the Standard Model. To observe such decays, $\eta$ meson sources with $N_{\eta} > 10^{13}$ per year are needed.

Source: http://arxiv.org/abs/hep-ph/9411271v1

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51

Sep 22, 2013
09/13

by
Jonathan Beck; Victor G. Kac

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We describe explicitly the canonical map $\chi:$ Spec $\ue(\a{g})\ \rightarrow \ $Spec $\ze$, where $\ue(\a{g})$ is a quantum loop algebra at an odd root of unity $\ve$. Here $\ze$ is the center of $\ue(\a{g})$ and Spec $R$ stands for the set of all finite--dimensional irreducible representations of an algebra $R$. We show that Spec $\ze$ is a Poisson proalgebraic group which is essentially the group of points of $G$ over the regular adeles concentrated at $0$ and $\infty$. Our main result is...

Source: http://arxiv.org/abs/hep-th/9410189v3

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Jul 20, 2013
07/13

by
Jeffrey A. Willick; Stephane Courteau; Sandra M. Faber; David Burstein; Avishai Dekel

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We have combined five Tully-Fisher (TF) redshift-distance samples for peculiar velocity analysis: the cluster data of Han, Mould and coworkers (1991-93, HM) and Willick (1991, W91CL), and the field data of Aaronson et al. (1992), Willick (1991), Courteau & Faber (1992), and Mathewson et al. (1992), totaling over 3000 spiral galaxies. We treat the cluster data in this paper, which is the first of a series; in Paper II we treat the field TF samples. These data are to be combined with...

Source: http://arxiv.org/abs/astro-ph/9411046v1

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Jul 20, 2013
07/13

by
Luis Masperi; Sandra Savaglio

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It is shown that the axion concentrated in electroweak strings which are consequently stabilized may produce a rotation of the polarization angle of radiation from extragalactic sources larger than that caused by a background field, and that axionic walls attached to global strings have an effect which depends on the frequency. We discuss the validity of the classical and quantum treatments of radiation and indicate that the latter produces conversion of linear into circular polarization. We...

Source: http://arxiv.org/abs/astro-ph/9411047v1

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75

Jul 20, 2013
07/13

by
S. Wiseman; E. Domany

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The critical behaviour of a bond-disordered Ashkin-Teller model on a square lattice is investigated by intensive Monte-Carlo simulations. A duality transformation is used to locate a critical plane of the disordered model. This critical plane corresponds to the line of critical points of the pure model, along which critical exponents vary continuously. Along this line the scaling exponent corresponding to randomness $\phi=(\alpha/\nu)$ varies continuously and is positive so that randomness is...

Source: http://arxiv.org/abs/cond-mat/9411046v1

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Jul 20, 2013
07/13

by
G. F. Mazenko; R. A. Wickham

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The theory of growth kinetics developed previously is extended to the asymmetric case of off-critical quenches for systems with a conserved scalar order parameter. In this instance the new parameter $M$, the average global value of the order parameter, enters the theory. For $M=0$ one has critical quenches, while for sufficiently large $M$ one approaches the coexistence curve. For all $M$ the theory supports a scaling solution for the order parameter correlation function with the...

Source: http://arxiv.org/abs/cond-mat/9411045v1

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83

Jul 20, 2013
07/13

by
Frithjof Karsch

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Modifications of hadron masses and some of their basic properties with temperature or nuclear density are considered as one possible signature for the formation of dense hadronic matter in nuclear collisions. We discuss here some basic results on the temperature dependence of hadron properties obtained from calculations of hadron correlation functions, the chiral condensate as well as the equation of state in finite temperature lattice QCD.

Source: http://arxiv.org/abs/hep-lat/9411021v1

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51

Sep 22, 2013
09/13

by
B. Siebert; G. Tian

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The authors learnt that similar results have been independently found by D.Zagier, V.Baranovsky and V.Balaji/A.King/P.Newstead. The corresponding references have been added (and some typos corrected).

Source: http://arxiv.org/abs/alg-geom/9410019v2

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77

Jul 20, 2013
07/13

by
F. Karsch; E. Meggiolaro; L. Turko

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Using the monomer--dimer representation of the lattice Schwinger model, with $N_f =1$ Wilson fermions in the strong--coupling regime ($\beta=0$), we evaluate its partition function, $Z$, exactly on finite lattices. By studying the zeroes of $Z(k)$ in the complex plane $(Re(k),Im(k))$ for a large number of small lattices, we find the zeroes closest to the real axis for infinite stripes in temporal direction and spatial extent $S=2$ and 3. We find evidence for the existence of a critical value...

Source: http://arxiv.org/abs/hep-lat/9411019v1

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85

Jul 20, 2013
07/13

by
Florian Nill; Hans-Werner Wiesbrock

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Given an irreducible inclusion of infinite von-Neumann-algebras $\cn \subset \cm$ together with a conditional expectation $ E : \cm \rightarrow \cm $ such that the inclusion has depth 2, we show quite explicitely how $\cn $ can be viewed as the fixed point algebra of $\cm$ w.r.t. an outer action of a compact Kac-algebra acting on $\cm$. This gives an alternative proof, under this special setting of a more general result of M. Enock and R. Nest, [E-N], see also S. Yamagami, [Ya2].

Source: http://arxiv.org/abs/hep-th/9411084v1

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Jul 20, 2013
07/13

by
J. A. Caballero; E. Garrido; E. Moya de Guerra; P. Sarriguren; J. M. Udias

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We study the properties of the spin dependent one body density in momentum space for odd--A polarized deformed nuclei within the mean field approximation. We derive analytic expressions connecting intrinsic and laboratory momentum distributions. The latter are related to observable transition densities in {\bf p}--space that can be probed in one nucleon knock--out reactions from polarized targets. It is shown that most of the information contained in the intrinsic spin dependent momentum...

Source: http://arxiv.org/abs/nucl-th/9411008v1

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64

Jul 20, 2013
07/13

by
Philip C. Argyres; Alon E. Faraggi

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We present an exact description of the metric on the moduli space of vacua and the spectrum of massive states for four dimensional N=2 supersymmetric SU(n) gauge theories. The moduli space of quantum vacua is identified with the moduli space of a special set of genus n-1 hyperelliptic Riemann surfaces.

Source: http://arxiv.org/abs/hep-th/9411057v2

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Jul 20, 2013
07/13

by
B. ~Ehrnsperger; A. ~Schäfer

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We reanalyse hyperon beta decay data to extract the corresponding F and D values. We show that flavour symmetry breaking effects lead naturally to a reduction of the $F/D$ ratio. For proton and neutron our analyses suggests $F/D = 0.49 \pm 0.08$ instead of $F/D = 0.575 \pm 0.016$ which is generally used to analyse the spin data. Our smaller $F/D$ value allows to fullfil the Ellis--Jaffe sum rule implying an unpolarized $s\bar s$-sea.

Source: http://arxiv.org/abs/hep-ph/9411267v1

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Jul 20, 2013
07/13

by
Luis J Boya; Alejandro Rivero

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We build a toy model of the Wilson-Kogut renormalization group in one dimensional Quantum Mechanics. With it, we show how the RG flow in the space of 1-D S matrices of finite range defines, as renormalized interactions, the known four parametric set of contact interactions, thus providing a suitable framework for its study.

Source: http://arxiv.org/abs/hep-th/9411081v1

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Jul 20, 2013
07/13

by
Bernd A. Berg; Ulrich H. E. Hansmann; Yuko Okamoto

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We comment on a recent article by Hao and Scheraga.

Source: http://arxiv.org/abs/chem-ph/9411007v1

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68

Jul 20, 2013
07/13

by
Bruce A. Campbell; Keith A. Olive

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We consider the effects of the time dependence of couplings due to their dependence on a dilaton field, as occurs in superstring theory, as well as in gravity theories of the Jordan-Brans-Dicke type. Because the scale parameters of couplings set by dimensional transmutation depend exponentially on the dilaton vev, we may obtain stringent limits on the shift of the dilaton from the requirement that the induced shift in the couplings not vitiate the successful calculations of element abundances...

Source: http://arxiv.org/abs/hep-ph/9411272v1

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Jul 20, 2013
07/13

by
A. Denner; S. Dittmaier; R. Schuster

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We investigate the sensitivity of the reaction $\gamma\gamma\to W^+W^-$ to the Higgs sector based on the complete one-loop corrections in the minimal Standard Model and the gauged non-linear $\sigma$-model. While this sensitivity is very strong for the suppressed cross-section of equally polarized photons and longitudinal W bosons, it is only marginal for the dominant mode of transverse polarizations. The corrections within the $\sigma$-model turn out to be UV-finite in accordance with the...

Source: http://arxiv.org/abs/hep-ph/9411268v1

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Jul 20, 2013
07/13

by
B. Ancochea; A. Bramon

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Quantum interference effects between past and future events (neutral kaon transitions, including CP violating decays) are discussed for entangled kaon pairs produced through $\phi \to K^0 \bar{K^0}$ in $\phi$-factories. Contrasting with the exciting conclusions of other recent analyses, we predict the inexistence of such an observable effect.

Source: http://arxiv.org/abs/hep-ph/9411270v1

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Jul 20, 2013
07/13

by
Franz Embacher

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Recently, it has been shown that an infinite succession of classical signature changes (''signature oscillations'') can compactify and stabilize internal dimensions, and simultaneously leads, after a coarse graining type of average procedure, to an effective (''physical'') space-time geometry displaying the usual Lorentzian metric signature. Here, we consider a minimally coupled scalar field on such an oscillating background and study its effective dynamics. It turns out that the resulting...

Source: http://arxiv.org/abs/gr-qc/9411028v1

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Jul 20, 2013
07/13

by
R. Resta; S. Sorella

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The ferroelectric polarization of perovskite oxides is much larger than implied by displacement of static ionic charges. We use an explicitly correlated scheme to investigate the phenomenon; charge transport is evaluated as a geometric quantum phase. Both covalence and electron-electron interaction enhance polarization in the weakly correlated regime. At higher values of the electron-electron interaction, the system undergoes a transition from a band insulator to a Mott insulator: the static...

Source: http://arxiv.org/abs/cond-mat/9411050v1

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Jul 20, 2013
07/13

by
Ramesh Narayan; Matthias Bartelmann

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We propose a new technique, which we call the lens parallax method, to determine simultaneously the redshift distribution of the faint blue galaxies and the mass distribution of foreground clusters of galaxies. The method is based on gravitational lensing and uses the fact that the mean angular size of the faint blue galaxies is a well-determined function of surface brightness. The method requires first a calibration of the angular-size vs. surface brightness relation in unlensed blank fields...

Source: http://arxiv.org/abs/astro-ph/9411048v1